Add a flag to guard deice check-in request

The flag is a system property which is modifiable at runtime. The
default behavior is that check-in request is diabled.

Additionally, we want to make all tags loggable in userdebug and eng
build by default.

Fix: 275420785
Test: manually verified
Change-Id: Ia8cea211211d575a3997d8791f7a165ba5eb2a97
2 files changed